Netasil PU Series

Netasil silicone series products are tin-based silicones that stand out with their easy working properties and long shelf life. They can be coloured with colouring pigments. The catalyst ratio of 5% increases the amount of fluidity before casting. It is recommended to purify the product from air bubbles and gas by using a vacuum machine before casting to obtain better results.

Netasil silicone series products can be thickened with Tixo additive for brush application. Thus, it becomes suitable for plastering operations.

In order to get full efficiency from Neta-Sil silicones, it is necessary to weigh the A and B components using a balance.

Since each application may be unique, a small test is recommended to determine the appropriate material for your project.

Safety – Use in a properly ventilated area. Wear safety glasses, long sleeves and rubber gloves to minimise the risk of contamination. Wear vinyl gloves only, latex gloves will prevent hardening. Store and use the material at room temperature (23 °C). Storing the material at a temperature other than room temperature will shorten the usable shelf life. The shelf life of the products is limited and should be used as soon as possible.

What to do in case of surface-silicone incompatibility

Neta-Sil silicone sealant may be inhibited by sulphur-based clay, which may result in a lack of curing. if you are in doubt about the compatibility between the silicone and the surface, a small-scale test is recommended. if you apply a small amount of silicone to the surface to be applied and after the curing time has elapsed, if the silicone is sticky and curing has not taken place, inhibition has occurred. To prevent this, it will be sufficient to spray a “barrier coating” of transparent acrylic lacquer on the surface where the silicone will be applied.

Before starting, mix part B thoroughly to redistribute any pigments that may have settled.

Using a balance, pour the amount of components A and B you will use into a container and mix for 3 minutes. Once the products are well mixed, vacuuming is recommended to eliminate trapped air. Your vacuum pump should draw a minimum of 29 inches of mercury (or 1 Bar / 100 KPa). Vacuum the material until it rises, breaks and falls. Vacuum for 1 minute after the material falls.

For maximum efficiency, pour the mixture into a single point at the bottom of the enclosure. Allow the silicone to level on and above the model. A smooth flow will help minimise trapped air. The liquid silicone should be leveled at least 1.3 cm above the highest point of the model surface. Allow the mould to cure overnight (at least 16 hours) at room temperature (23°C) before demoulding. Curing the mould at 65°C for a further 4 hours will prevent some condensation reactions. Allow the mould to cool to room temperature before use. Do not cure silicone where the temperature is lower than 18°C.

The life of the mould you produce will vary according to how you use it (casting material, frequency, etc.). Casting abrasive materials such as concrete can quickly erode the mould details, while casting non-abrasive materials (wax) will not affect the mould details. Before storage, the mould should be cleaned with a soapy solution and dried. Moulds should be stored in a cool and dry environment on a flat surface.